Office (OLE) / .DOC malware analysis — malicious · b38db3a26989da87

MALICIOUS

Office (OLE) / .DOC

34.0 KB Created: 2020-06-10 13:33:00 Authoring application: Microsoft Office Word

MD5: 767bd1ba83cc7509e1bac78bdd4e00ee SHA-1: c4ab93d9a106e098c1275a5e581ad46a146b464a SHA-256: b38db3a26989da875d7c312cf3749b8dd85e4a8533d77cb6ebb527276a9a5c77

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is a Microsoft Word document containing VBA macros, indicated by multiple heuristic firings including OLE_VBA_MACROS, OLE_VBA_AUTOOPEN, and OLE_VBA_WBOPEN. A critical heuristic, OLE_VBA_SHELL, confirms the presence of a Shell() call within the VBA code. This suggests the macros are intended to execute arbitrary commands, likely to download and run a second-stage payload. The ClamAV detection further supports its malicious nature as a downloader. No specific family could be identified, but the techniques used are common for initial access and payload delivery.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
ClamAV: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `f765c42d6c5197e8693426b5011668c5780b8ed0176ed18ab94879223a797f5b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3917 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 201 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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